/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Switches a multi parent element to its first parent This sets the new parent's weight to 1.0 and disables weights for all other potential parents.
Returns true if changing the weight was successful
bool SwitchToDefaultParent ( [FRigBaseElement](API\Plugins\ControlRig\Rigs\FRigBaseElement) * InChild, bool bInitial, bool bAffectChildren )